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<h1 class="title">custominputhandler.cpp Example File</h1>
<span class="subtitle">texturesurface/custominputhandler.cpp</span>
<!-- $$$texturesurface/custominputhandler.cpp-description -->
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<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Data Visualization module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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** $QT_END_LICENSE$
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****************************************************************************/</span>
<span class="preprocessor">#include "custominputhandler.h"</span>
<span class="preprocessor">#include <QtDataVisualization/Q3DCamera></span>
<span class="preprocessor">#include <QtCore/qmath.h></span>
CustomInputHandler<span class="operator">::</span>CustomInputHandler(QAbstract3DGraph <span class="operator">*</span>graph<span class="operator">,</span> <span class="type">QObject</span> <span class="operator">*</span>parent) :
<span class="type"><a href="q3dinputhandler.html">Q3DInputHandler</a></span>(parent)<span class="operator">,</span>
m_highlight(<span class="number">0</span>)<span class="operator">,</span>
m_mousePressed(<span class="keyword">false</span>)<span class="operator">,</span>
m_state(StateNormal)<span class="operator">,</span>
m_axisX(<span class="number">0</span>)<span class="operator">,</span>
m_axisZ(<span class="number">0</span>)<span class="operator">,</span>
m_speedModifier(<span class="number">20.0f</span>)
{
<span class="comment">// Connect to the item selection signal from graph</span>
connect(graph<span class="operator">,</span> <span class="operator">&</span>QAbstract3DGraph<span class="operator">::</span>selectedElementChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span>
<span class="operator">&</span>CustomInputHandler<span class="operator">::</span>handleElementSelected);
}
<span class="type">void</span> CustomInputHandler<span class="operator">::</span>mousePressEvent(<span class="type">QMouseEvent</span> <span class="operator">*</span>event<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QPoint</span> <span class="operator">&</span>mousePos)
{
<span class="keyword">if</span> (<span class="type">Qt</span><span class="operator">::</span>LeftButton <span class="operator">=</span><span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>button()) {
m_highlight<span class="operator">-</span><span class="operator">></span>setVisible(<span class="keyword">false</span>);
m_mousePressed <span class="operator">=</span> <span class="keyword">true</span>;
}
<span class="type"><a href="q3dinputhandler.html">Q3DInputHandler</a></span><span class="operator">::</span>mousePressEvent(event<span class="operator">,</span> mousePos);
}
<span class="type">void</span> CustomInputHandler<span class="operator">::</span>wheelEvent(<span class="type">QWheelEvent</span> <span class="operator">*</span>event)
{
<span class="type">float</span> delta <span class="operator">=</span> <span class="type">float</span>(event<span class="operator">-</span><span class="operator">></span>delta());
m_axisXMinValue <span class="operator">+</span><span class="operator">=</span> delta;
m_axisXMaxValue <span class="operator">-</span><span class="operator">=</span> delta;
m_axisZMinValue <span class="operator">+</span><span class="operator">=</span> delta;
m_axisZMaxValue <span class="operator">-</span><span class="operator">=</span> delta;
checkConstraints();
<span class="type">float</span> y <span class="operator">=</span> (m_axisXMaxValue <span class="operator">-</span> m_axisXMinValue) <span class="operator">*</span> m_aspectRatio;
m_axisX<span class="operator">-</span><span class="operator">></span>setRange(m_axisXMinValue<span class="operator">,</span> m_axisXMaxValue);
m_axisY<span class="operator">-</span><span class="operator">></span>setRange(<span class="number">100.0f</span><span class="operator">,</span> y);
m_axisZ<span class="operator">-</span><span class="operator">></span>setRange(m_axisZMinValue<span class="operator">,</span> m_axisZMaxValue);
}
<span class="type">void</span> CustomInputHandler<span class="operator">::</span>mouseMoveEvent(<span class="type">QMouseEvent</span> <span class="operator">*</span>event<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QPoint</span> <span class="operator">&</span>mousePos)
{
<span class="comment">// Check if we're trying to drag axis label</span>
<span class="keyword">if</span> (m_mousePressed <span class="operator">&</span><span class="operator">&</span> m_state <span class="operator">!</span><span class="operator">=</span> StateNormal) {
setPreviousInputPos(inputPosition());
setInputPosition(mousePos);
handleAxisDragging();
} <span class="keyword">else</span> {
<span class="type"><a href="q3dinputhandler.html">Q3DInputHandler</a></span><span class="operator">::</span>mouseMoveEvent(event<span class="operator">,</span> mousePos);
}
}
<span class="type">void</span> CustomInputHandler<span class="operator">::</span>mouseReleaseEvent(<span class="type">QMouseEvent</span> <span class="operator">*</span>event<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QPoint</span> <span class="operator">&</span>mousePos)
{
<span class="type"><a href="q3dinputhandler.html">Q3DInputHandler</a></span><span class="operator">::</span>mouseReleaseEvent(event<span class="operator">,</span> mousePos);
m_mousePressed <span class="operator">=</span> <span class="keyword">false</span>;
m_state <span class="operator">=</span> StateNormal;
}
<span class="type">void</span> CustomInputHandler<span class="operator">::</span>handleElementSelected(QAbstract3DGraph<span class="operator">::</span>ElementType type)
{
<span class="keyword">switch</span> (type) {
<span class="keyword">case</span> QAbstract3DGraph<span class="operator">::</span>ElementAxisXLabel:
m_state <span class="operator">=</span> StateDraggingX;
<span class="keyword">break</span>;
<span class="keyword">case</span> QAbstract3DGraph<span class="operator">::</span>ElementAxisZLabel:
m_state <span class="operator">=</span> StateDraggingZ;
<span class="keyword">break</span>;
<span class="keyword">default</span>:
m_state <span class="operator">=</span> StateNormal;
<span class="keyword">break</span>;
}
}
<span class="type">void</span> CustomInputHandler<span class="operator">::</span>handleAxisDragging()
{
<span class="type">float</span> distance <span class="operator">=</span> <span class="number">0.0f</span>;
<span class="comment">// Get scene orientation from active camera</span>
<span class="type">float</span> xRotation <span class="operator">=</span> scene()<span class="operator">-</span><span class="operator">></span>activeCamera()<span class="operator">-</span><span class="operator">></span>xRotation();
<span class="comment">// Calculate directional drag multipliers based on rotation</span>
<span class="type">float</span> xMulX <span class="operator">=</span> qCos(qDegreesToRadians(xRotation));
<span class="type">float</span> xMulY <span class="operator">=</span> qSin(qDegreesToRadians(xRotation));
<span class="type">float</span> zMulX <span class="operator">=</span> qSin(qDegreesToRadians(xRotation));
<span class="type">float</span> zMulY <span class="operator">=</span> qCos(qDegreesToRadians(xRotation));
<span class="comment">// Get the drag amount</span>
<span class="type">QPoint</span> move <span class="operator">=</span> inputPosition() <span class="operator">-</span> previousInputPos();
<span class="comment">// Adjust axes</span>
<span class="keyword">switch</span> (m_state) {
<span class="keyword">case</span> StateDraggingX:
distance <span class="operator">=</span> (move<span class="operator">.</span>x() <span class="operator">*</span> xMulX <span class="operator">-</span> move<span class="operator">.</span>y() <span class="operator">*</span> xMulY) <span class="operator">*</span> m_speedModifier;
m_axisXMinValue <span class="operator">-</span><span class="operator">=</span> distance;
m_axisXMaxValue <span class="operator">-</span><span class="operator">=</span> distance;
<span class="keyword">if</span> (m_axisXMinValue <span class="operator"><</span> m_areaMinValue) {
<span class="type">float</span> dist <span class="operator">=</span> m_axisXMaxValue <span class="operator">-</span> m_axisXMinValue;
m_axisXMinValue <span class="operator">=</span> m_areaMinValue;
m_axisXMaxValue <span class="operator">=</span> m_axisXMinValue <span class="operator">+</span> dist;
}
<span class="keyword">if</span> (m_axisXMaxValue <span class="operator">></span> m_areaMaxValue) {
<span class="type">float</span> dist <span class="operator">=</span> m_axisXMaxValue <span class="operator">-</span> m_axisXMinValue;
m_axisXMaxValue <span class="operator">=</span> m_areaMaxValue;
m_axisXMinValue <span class="operator">=</span> m_axisXMaxValue <span class="operator">-</span> dist;
}
m_axisX<span class="operator">-</span><span class="operator">></span>setRange(m_axisXMinValue<span class="operator">,</span> m_axisXMaxValue);
<span class="keyword">break</span>;
<span class="keyword">case</span> StateDraggingZ:
distance <span class="operator">=</span> (move<span class="operator">.</span>x() <span class="operator">*</span> zMulX <span class="operator">+</span> move<span class="operator">.</span>y() <span class="operator">*</span> zMulY) <span class="operator">*</span> m_speedModifier;
m_axisZMinValue <span class="operator">+</span><span class="operator">=</span> distance;
m_axisZMaxValue <span class="operator">+</span><span class="operator">=</span> distance;
<span class="keyword">if</span> (m_axisZMinValue <span class="operator"><</span> m_areaMinValue) {
<span class="type">float</span> dist <span class="operator">=</span> m_axisZMaxValue <span class="operator">-</span> m_axisZMinValue;
m_axisZMinValue <span class="operator">=</span> m_areaMinValue;
m_axisZMaxValue <span class="operator">=</span> m_axisZMinValue <span class="operator">+</span> dist;
}
<span class="keyword">if</span> (m_axisZMaxValue <span class="operator">></span> m_areaMaxValue) {
<span class="type">float</span> dist <span class="operator">=</span> m_axisZMaxValue <span class="operator">-</span> m_axisZMinValue;
m_axisZMaxValue <span class="operator">=</span> m_areaMaxValue;
m_axisZMinValue <span class="operator">=</span> m_axisZMaxValue <span class="operator">-</span> dist;
}
m_axisZ<span class="operator">-</span><span class="operator">></span>setRange(m_axisZMinValue<span class="operator">,</span> m_axisZMaxValue);
<span class="keyword">break</span>;
<span class="keyword">default</span>:
<span class="keyword">break</span>;
}
}
<span class="type">void</span> CustomInputHandler<span class="operator">::</span>checkConstraints()
{
<span class="keyword">if</span> (m_axisXMinValue <span class="operator"><</span> m_areaMinValue)
m_axisXMinValue <span class="operator">=</span> m_areaMinValue;
<span class="keyword">if</span> (m_axisXMaxValue <span class="operator">></span> m_areaMaxValue)
m_axisXMaxValue <span class="operator">=</span> m_areaMaxValue;
<span class="comment">// Don't allow too much zoom in</span>
<span class="keyword">if</span> ((m_axisXMaxValue <span class="operator">-</span> m_axisXMinValue) <span class="operator"><</span> m_axisXMinRange) {
<span class="type">float</span> adjust <span class="operator">=</span> (m_axisXMinRange <span class="operator">-</span> (m_axisXMaxValue <span class="operator">-</span> m_axisXMinValue)) <span class="operator">/</span> <span class="number">2.0f</span>;
m_axisXMinValue <span class="operator">-</span><span class="operator">=</span> adjust;
m_axisXMaxValue <span class="operator">+</span><span class="operator">=</span> adjust;
}
<span class="keyword">if</span> (m_axisZMinValue <span class="operator"><</span> m_areaMinValue)
m_axisZMinValue <span class="operator">=</span> m_areaMinValue;
<span class="keyword">if</span> (m_axisZMaxValue <span class="operator">></span> m_areaMaxValue)
m_axisZMaxValue <span class="operator">=</span> m_areaMaxValue;
<span class="comment">// Don't allow too much zoom in</span>
<span class="keyword">if</span> ((m_axisZMaxValue <span class="operator">-</span> m_axisZMinValue) <span class="operator"><</span> m_axisZMinRange) {
<span class="type">float</span> adjust <span class="operator">=</span> (m_axisZMinRange <span class="operator">-</span> (m_axisZMaxValue <span class="operator">-</span> m_axisZMinValue)) <span class="operator">/</span> <span class="number">2.0f</span>;
m_axisZMinValue <span class="operator">-</span><span class="operator">=</span> adjust;
m_axisZMaxValue <span class="operator">+</span><span class="operator">=</span> adjust;
}
}
</pre>
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<!-- @@@texturesurface/custominputhandler.cpp -->
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